Gelatinous film and process of forming the same.



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EUGENE ADGLCPHE PIN, OF GLICHY, CE.

GELATINOUS IEILM AND PROCESS OF FORMING THE SAME.

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Ito Drawing.

.which a film of gelatin, or other substance adapted to form a filmwhendried, can be formed on a support, for instance of paper, to which thefilm will adhere so as to enable it to be subjected to the manipulationsrequired in photography; but from which it can be nevertheless easilydetached, so that the film thus separated from its support, can be usedas a transparency.

In the following description the film will be taken by 'way of exampleto bea photographic film, and the support, a sheet of paper; but theinvention is not limited to a photographic film or a paper support.

Soap suds are obtained by preparing hot (at the boiling temperature) anaqueous solution of any desired soap (soda lye' and any oil),preferably'a soap made from cocoanut oil, with or without the additionof foreign substances such as "resins and waxes. The soap is'firstdissolved in a little water, and after it. is completely dissolved, sucha quantity of water is added that the final product contains one literof water per 8 grams of soap. These proportions are not, however,absolutely essential, and are given merely by way of example. 4

Paper of the desired size and strength is then taken, and the solutionobtained as described is spread thereon preferably by means of ordinaryemulsioning apparatus. Then it is left to dry or it is dried. Then onthe said paper the film is formed and soap is preferably incorporatedwith the film-forming-substances.

The various operations can be advantageously carried out in thefollowing manner :-1000 grams of gelatin are taken and soaked cold in8000 grams of water. The product thus obtained is placed in a water bathto raise its temperature to about 80 Q As soon as the gelatin isdissolved, a solution is added to it of 20 grams of 6% chrome alum and200 grams of water. The mixture thus obtained is maintained in aSpecification of Letters Patent.

Patented May so, rare.

Application filed January 20, 1916. Serial No. 73,128.

liquid state; and at the expiration of about .half an hour, first asolution is stirred in of 166 grams of soap and 500 grams of water, andthen 100 cubic centimeters of glycerin at 28 are added. This composi--t1on is then spread on the previously presioning apparatus.

The whole is dried or left to dry, and the said paper will be found tobe covered with a film which adheres to it, but is nevertheless readilydetachable. These various operations are completed by the spreading of aphotographic sensitive layer, 1n the usual manner. Thus a photographicpaper is obtained With a film, which, as proved by experlence, offers,from the point of view pared paper, preferably by ordinary emul- 'ofadhesion to the paper, very-special qualities. It can be subjected toany manipulatlons to which photographic proofs have to be subjectedwithout risk of becoming acci dentally detached.

Obviously the invention is not limited to the methods described, butcomprises for instance using for a substratum, wood, glass or fabricinstead of paper, as well as employing for the film, acetate ofcellulose, mucilage, collodion or varnish.

I claim: I 1. A process of forming a gelatinous film ona temporarysupport, consisting in coating the support with an aqueous solution ofsoap and then depositing thereon a gelatinous substance.

2. A process of forming a gelatinous film on a temporary support,consisting in coating the support with an aqueous solution of soap, thendepositing thereon a mixture of a gelatinous substance and an aqueousso- 4. A process of forming a gelatinous film on a temporary-papersupport, consisting in coating'the support with an aqueous solutionofsoap made from cocoanut oil, then depositing thereon a mixture ofgelatin,

glycerin and an aqueous solution of soap nous substance and an aqueoussolution of 10 soap. r 1

'6. A film on a temporary support, comprising'a gelatinous substancedeposited on the temporary supportpreviously coated with} anaqueoussolution of soap. A film, on a temporary support comprlsing'agelatinous substance with an addition vof an aqueous solution of soap,def posited on the temporary support previously coated with an aqueoussolution of soap. 1

' hotographic film on 'a' temporary support, comprising a gelatinoussubstance with an addition of an aqueous solution of soap, deposited onthe temporary support previously coated with an aqueous solution ofsoap, and a sensitive layer deposited on the gelatinous-film 9. Aphotographic film on a temporary support, comprising a mixture ofgelatin and glycerin, with an addition of an aqueous solution of soapmade from cocoanut oil deposited on a temporary paper support previouslycoated with an aqueous solution of soap made from cocoanut oil, and asensitive layer deposited on the gelatinous film.

10. A film on a temporary support, comprising a gelatinous substancewith an addition of an aqueous solution of soap, deposited on atemporary support previously coated with an aqueous solution of soap,with resinous substances incorporated.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

EUGENE ADOLPI-IE PIN.

Witnesses:

EMILE LEDRET, CHAS. P. PRESSLY.

